Machine for forging metals.



I. FIELDING. MAGHIHE FOR FORGING METALS. I APPLIOATIQN rut-:1) AUG 18, 1009 Patenigd June 28,1910.

// fi/ ///////W///// JOHN FIELDING, OF GLOUGESTER, ENGLAND.

MACHINE FOR FORGING METALS.

Specification of Letters latcnt.

Patented J one 28, 1910.

Application filed August 18, 1909. Serial No. 513,475.

To all whom it may concern:

Be it known that I, JOHN FIELDING, of Sherborne House, in the city and county of Gloucester, in the United Kingdom of Great Britain and Ireland, a subject of the King of England, have invented a new and usefu Machine for Forging Metals, of which the following is a. specification.

The success which has been achieved by large hydraulic presses in the production of forgings of the heaviest class has led to many attempts to construct smaller hydraulic presses capable of rapid action, with a View to superseding steam hammers for dealing with medium or lighter class forgings. Such so called quick acting forging presses howeverare much slower than the steam hammer and generally involve more or less complication, and the object of my invention is to combine in one machine the advantages of both press and hammer, so that the first partof the work while the forging is hot may be done by the machine working as a hydraulic press at a moderate speed of about twenty strokes per minute and the finishing, when theforging is colder, may be performed by the hammer action at a speed of workin which cannot be approached by what is called a quick-spoed press.

The accompanying drawing shows a convenient form in which my invention may be carried out, but I do not limit myself to this form only, as such a combination of hammer and press may be efi'ectcd in various ways providing that the hammer piston and bydranlic ram operate relatively to each other in the manner described and shown in the drawing.

The accompanying drawing shows a machine according to the present invention in a vertical section.

Referring to the drawing A is the hammcr cylinder, with its piston B, stalling box C, piston rod D, and tap E, F is a hydraulic cylinder in which works the hydraulic piston G fitted with a ram H, which works on the upper end of the hammer cylinder A, and is fitted with piston rings to maintain a pressure tight fit therein. Water is admit ted to the top of cylinder F by the passage I and steam or air to the underside of piston G by the passage J. The c lindcr A is provided with passages K, L, or the admission of steam or air as is usual in steam hammers.

The operation of the machine is as follows:lVhen it is desired to work the hammer only the piston G and ram H are held at the top of their stroke by the pressure of steam or air beneath the piston G. Under these conditions the hammer piston B can be freely worked exactly as in any ordinary steam hammer. To work as a hydraulic press low pressure water is admitted to the upper end of the cylinder F and pressure is relieved beneath the piston G and B provision being preferably made so that somewhat greater pressure remains to act under B than under G, so that contact between the lower surface of ram H and upper surface of piston B is maintained as they fall through the idle part of their stroke. This can be done by suitably restricting the escape of steam or air from beneath piston B to agreater degree than beneath piston G. The upper end of cylinder F being charged with low pressure water as the piston G descends, high pressure is only admitted to produce the reuired impression on the forging. To efl ect the upward movement of the hammer and yu'ess piston pressure is admitted to the lower ends of both cylinders.

Having now particularly described the nature 0t my said invention, and in what manner the same is to be performed, I declare that what I claim is:

I. In a forging machine, the combina tion of a steam cylinder, hammer, and ahummer piston, with a hydraulic forging press cylinder and a press ram, the press ram being independent from the hammer piston and arranged above the latter to act upon the same when the machine is working as a hydraulic press, substantially as described.

In a forging machine. the combina tion of a cylinder having ahammer piston therein. and steam passages above and underneath the hammer piston, with a superimposed m-linder having a press ram independent from the hammer )istou, and a steam pas-sage underneath, {UK a water passage above the press ram, as and for the purpose set forth.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

JOHN FIELDING.

Witnesses Faun Mroonu'rou, M. K. ALLAWAY. 

